断层对普朗铜矿底部结构稳定性影响分析

Analysis of the Influence of Fault on the Stability of the Bottom Structure of Pulang Copper Mine

普朗铜矿底部结构岩层中断层纵横交错,矿区首采区赋存的5条断层将矿体纵横切割,断层及附近影响带矿岩破碎,岩石自承载能力差,底部结构容易发生变形破坏。通过对现场破坏情况的长期跟踪调查,分析得出普朗铜矿底部结构属于“强顶弱帮”型。采用FLAC3D数值模拟软件,通过逐渐增大底部结构的竖向应力,模拟分析在不同矿石堆积厚度下底部结构断层附近的围岩力学状态。结果得出,断层附近围岩位移变形较大,底部结构应力状态跟断层的分布有关,断层对底部结构稳定性影响较大。

The faults in the rock strata of the bottom structure of Pulang Copper Mine are crisscrossed.The five faults in the first mining area cut the ore body vertically and horizontally.The ore rock in the fault and the nearby influence zone is broken,the rock self-bearing capacity is poor,and the bottom structure is prone to deformation and failure.Through the long-term follow-up investigation of the site damage,it is concluded that the bottom structure of Pulang Copper Mine belongs to the type of’strong top and weak side’.Using FLAC3Dnumerical simulation software,by gradually increasing the vertical stress of the bottom structure,the mechanical state of surrounding rock near the bottom structure fault under different ore accumulation thicknesses is simulated and analyzed.The results show that the displacement and deformation of surrounding rock near the fault are large,the stress state of the bottom structure is related to the distribution of the fault,and the fault has a great influence on the stability of the bottom structure.